已知函数f(x)=12x2+alnx(a∈R).(1)若a=-1,求f(x)的单

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问题:

已知函数f(x)=
1
2
x2+alnx(a∈R)

(1)若a=-1,求f(x)的单调递增区间;
(2)当x>1时,f(x)>lnx恒成立,求实数a的取值范围.
考点:函数的单调性与导数的关系函数的最值与导数的关系
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男,48岁,医师,某年12月22日入院,畏寒、发热6天,近4天加重,面部出现出血点,血压下降,发绀,1天来无尿入院。同年11月去湘西出差,当地有类似发热病流行,12月中旬返长沙。体检:体温36.6℃,血压90/60mmHg,脉搏110次/分,呼吸28次/分,重病容,神志尚清,全身散在多个出血点,两腋下抓痕样出血,球结膜水肿、充血,血常规:WBC  54.1×109/L,PLT  89×109/L。尿蛋白+++,诊断应首先考虑

A.败血症

B.伤寒

C.钩体病

D.急性肾小球肾炎

E.肾综合征出血热

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Internet上许多不同的网络和许多不同类型的计算机赖以互相通信的基础是TCP/IP

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混凝土灌注桩的材料质量要求中,钢筋的品种、规格均应符合设计要求,并有出厂材质书和检测报告()

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古建筑火灾有哪些特点?

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The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of counterclockwise), you must indicate whether.

A CEO is building an extra-wide garage in which to park his limousines. The garage is x feet wide, and at least 2 feet of space is required between each two cars and between the cars and the walls. Will all 9 limousines fit in the garage ?()
(1) The average width of the limousines is the square root of x.
(2) x=100.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

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